CN1063479A - The preparation of alkene - Google Patents

Abstract

This paper has disclosed a kind of method for preparing ethene or ethene and vinyl chloride mixture by ethane and chlorine reaction.This method comprises: under the temperature that ethane and chlorine do not react in mixing process, the ratio that was at least 0.9: 1 according to ethane/cl molar ratio is closely mixed ethane with chlorine, heat this mixture then to surpassing 215 ℃ with initiation reaction, allow this reaction be less than one minute time, and to the mixture that is reacting enough heats are provided so that the temperature of post reaction mixture in 400 ℃～800 ℃ scopes.

Description

The preparation of alkene

The present invention relates to a kind of method for preparing ethene and ethene and vinyl chloride mixture.More particularly, the present invention relates to a kind of new method for preparing ethene and ethene and vinyl chloride mixture.

Ethene is a kind of of great value product that is widely used.In order to prepare other vinylchlorid of various level, only in the used up ethene amount of the annual institute of the U.S. just above 10,000,000,000 pounds.

Another important use of ethene is as the starting raw material of preparation vinylchlorid, prepares polyvinyl chloride (PVC) by polymerization then.

Because the consumption of annual ethene is huge, any economy and the better method for preparing ethene all cause the interest that people are very big.In present stage, ethene mainly is that this pyroprocess consumes lot of energy, is a kind of method of costliness by the high-temperature dehydrogenation preparation of ethane and cracking stock such as propane, butane, petroleum naphtha etc.

A large amount of trials has been arranged, attempted to develop a kind of feasible method, ethane or other low-carbon alkene and chlorine or chlorine-containing compound are reacted at a lower temperature and made its dehydrogenation.According to we at present known to, also do not have a kind of method can reach the feasible stage of industry in these previous trials.

No. the 2nd, 259,195, Baehr(United States Patent (USP)) disclosed that a kind of chlorine is used to make the method for the dehydrogenation of the alkane that contains 3-8 carbon atom and alkene, this method is chlorine and hydro carbons to be mixed to be incorporated in carry out gas-phase reaction under 300 ℃ to 800 ℃.In the Comparative Example A An in the present invention, we have demonstrated the process of embodiment 1 in the Baehr patent, almost make system's coking and obstruction when being raw material with ethane immediately.

Gorin etc. are at United States Patent (USP) 2,488, and having described a kind of in 083 is the method for liquid hydrocarbon with gasiform methane and conversion of natural gas.This method is to pass through to form a kind of halogenated alkane intermediate earlier, then carries out through the dehydrohalogenation condensation course, has wherein introduced hydrogenchloride and the isolating method of other gaseous matter.

People such as Dirstine (United States Patent (USP) 2,628,259) invented a kind of with ethane chlorination with the preparation vinylidene chloride (1, the 2-Ethylene Dichloride) and the method for vinylchlorid, this method is at 450 ℃-600 ℃, have dilution property gas to exist, and chlorine is to carry out under the 1.9-3.0 condition to the mol ratio of ethane.

Conrad(United States Patent (USP) 2,838,579) invented a kind of with ethane chlorination with preparation chloric ethane product such as monochloroethane, 1,1-ethylene dichloride, 1, the method of 2-ethylene dichloride or other desirable high monochloroethane, this method is in high pressure and 300-600 ℃ of temperature range, and under the condition that has a kind of charcoal coating particle type fluidized-bed organic catalyst to exist, carry out.

Mullineaux(United States Patent (USP) 2,890,253) invented and a kind ofly use iodine and oxygen and make the stable hydrocarbon that comprises ethane become the method for unsaturated hydrocarbons by dehydrogenation.Describing the ethane amount that (embodiment VI, the 10th hurdle) reacts away among the embodiment of iodine and ethane reaction at it only is 40%.

Taylor(United States Patent (USP) 3,166,601) invented a kind of ethane chlorination that makes preparing the method for unsaturated chlorizate, this method is to carry out under 600 ℃ to 900 ℃ temperature and the condition that has the inert diluent gas to exist.

Carroll(United States Patent (USP) 3,173,962) invented the method that a kind of alkane that will contain 2-6 carbon atom is converted into alkene and chloralkane, this method is included under 300 ℃ to 650 ℃ the temperature mixture with the gas of alkane, hydrogenchloride, oxygen or oxygen-containing component by a kind of catalyzer.

Bajars(United States Patent (USP) 3,207,011) invented the catalysis process of dehydrogenation of the aliphatic hydrocarbon of a kind of 4-6 of being used for carbon atom, this method comprises and is heated at least 450 ℃ until 1000 ℃ in the presence of catalyzer with containing the aliphatic hydrocarbon of 4-6 carbon atom and the material in oxygen and chloride source.

Riegel(United States Patent (USP) 3,557,229) invented a kind of with ethane oxychlorination with preparation vinylchlorid and be attended by monochloroethane, ethylene dichloride, ethene and catalysis process that other compound generates, the used reactant of this method is ethane, hydrochloric acid and contains the oxygen source thing.

Beard(United States Patent (USP) 3,558,735) invented a kind of catalytic oxidative dehydrogenation method that is used to prepare ethene, this method has been included in fluidizing cupric chloride and rare earth halide catalyst and has existed down, under 350 ℃ to 650 ℃ temperature ethane and hydrogenchloride and oxygen is reacted.

Beard(United States Patent (USP) 3,658,934; 3,702,311; With 3,862,996) invented a kind of catalysis process for preparing ethene, this method is included in inert gas diluent and a kind of catalyzer exists and ethane and halogen are reacted.

People such as Kroenke (United States Patent (USP) 4,119,570; 4,375,569; 4,461,919; With 4,467,127) in the invention of one series of patents, set forth a kind of with ethane oxychlorination to prepare the method for ethene, Ethylene Dichloride, vinylchlorid and monochloroethane mixture.In the method, ethane, oxygen (preferably from airborne oxygen) and a kind of chlorine source thing such as hydrogenchloride are having the catalyzer to exist and are reacting in 400 ℃ to 650 ℃ temperature range.

People such as Zaidman (United States Patent (USP) 4,217,311) have invented a kind of method for preparing vinylchlorid.This method is that the mixture with ethene and ethane reacts with chlorine in 300 to 550 ℃ temperature range, and wherein chlorine is to add at a plurality of points along conversion zone.

Li(United States Patent (USP) 4,300,005) invented a kind of alkane that will contain 2-4 carbon atom and prepared the catalysis process of single halogen substituted olefine and other product by oxi-chlorination, this method is to have catalyzer to exist and under 400-650 ℃ temperature alkane and hydrogen halide and a kind of oxygen source thing are being reacted.

People such as Pyke (245A) invented and a kind of ethane and chlorine source thing and oxygen reacted catalysis process with preparation vinylchlorid under 275-500 ℃ temperature by English Patent 2,095,242A and English Patent 2,095.

The invention provides a kind of method for preparing ethene and vinyl chloride mixture by ethane and chlorine reaction.The characteristics of this method are that the per pass conversion by the ethane of reactor is 50% or higher, and total molar yield of ethene and vinylchlorid is in used up ethane, more than 80%.The implementation process of the inventive method is: ethane is closely mixed with chlorine and with this mixture at an inerted reactor internal heating with initiation reaction, allow this reaction carry out fully, the temperature of reaction mixture of leaving reaction zone is in 600-800 ℃ scope, and ethane is 0.9: 1 or higher to the mol ratio of chlorine.

Brief Description Of Drawings:

Fig. 1 has depicted in the inventive method ethylene yield to the curved line relation of ethane in the raw material/chlorine mol ratio and temperature of reaction.

Fig. 2 has depicted the vinylchlorid productive rate to ethane in the raw material/chlorine mol ratio and temperature of reaction curved line relation.

Fig. 3 has depicted in the inventive method the monochloroethane productive rate to the curved line relation of ethane in the raw material/chlorine mol ratio and temperature of reaction.

Fig. 4 has depicted the curved line relation of the productive rate of ethane conversion and ethene, vinylchlorid, monochloroethane to the reaction times.

Fig. 5 is the synoptic diagram of the inventive method.

The invention provides the effective method that a kind of reaction by chlorine and ethane prepares ethene or ethene and vinyl chloride mixture.

The method for preparing ethene and vinylchlorid by ethane and chlorine reaction provided by the present invention comprises:

A, closely mix ethane and chlorine and make and form a mixture, ethane was at least 0.9: 1 the mol ratio of chlorine in this mixture, and its temperature must make chemical reaction does not take place in described mixing process basically;

B, this mixture is fed an inert reaction zone;

C, heat the interior mixture of this reaction zone with initiating chamical reaction and produce ethene and vinylchlorid; With

D, allow reaction carry out fully, temperature is 400-800 ℃ when making reaction mixture leave reaction zone;

According to said method, total molar yield of ethene and vinylchlorid is more than 80% in used up ethane.

Can think that ethane becomes ethene and vinylchlorid will experience a series of intermediate reactions with chlorine conversion.These intermediate reactions comprise:

(1) ethane chlorination generates the chlorination reaction of monochloroethane, and available following formula is described:

(2) the monochloroethane cracking forms vinylchlorid, and available following formula is described:

(3) ethane generates vinylchlorid by a series of chlorinations and dehydrogenation reaction, and available following net reaction is described:

(4) ethane dehydrogenation generates ethene, and available following formula is described:

In these reactions, the chlorination of ethane [reaction (1)] is a strong exothermal reaction, and one mole of monochloroethane of every generation produces 28.60 kilocalories heat.In the methods of the invention, heating ethane and chlorine gas mixture to the required heat of temperature of reaction can partly depend on reaction (1) at least.Reaction (3) also is thermopositive reaction, and one mole of vinylchlorid of every generation produces 41 kilocalories heat, also can be and realizes that the inventive method provides heat.Opposite, reaction (2) and (4) is thermo-negative reaction, one mole of monochloroethane of every reaction needs 17.27 kilocalories heat, and one mole of ethane of every reaction needs 32.74 kilocalories heat.

According to the present invention, ethane and chlorine are blended under the temperature that two kinds of gases do not react.Can believe that reaction (1) is the reaction that a free radical causes, the chlorine hot tearing becomes free radical, causes the chlorination reaction of ethane then.Because known this free radical can form when temperature is at least 215 ℃, so ethane and chlorine will mix when temperature is lower than 215 ℃.Although ethane and chlorine can mix easily at ambient temperature, they also can mix under higher a little temperature, if chlorine before mixing or mixed instantaneous in temperature be no more than 200 ℃ to 215 ℃.For example: the temperature of delivering to the ethane of mixing zone can be 200 ℃, and the temperature of chlorine can be 20 ℃, and like this according to the molar ratio of ethane and chlorine and their thermal capacitance, the temperature that can draw mixture is approximately 180 ℃.Importantly used chlorine should be the chlorine of gaseous phase, and does not have liquid chlorine to exist, because liquid chlorine can cause beyond thought blast.

When implementing the inventive method, the mol ratio care should be used to of chlorine and ethane is selected in the raw mix.Ethane is high more to the mol ratio of chlorine, and the productive rate of vinylchlorid is just low more.If use very a spot of chlorine, reaction will produce by product hardly, and the productive rate of vinylchlorid is very low, and can be left a large amount of unreacted ethane, and the result will carry out meticulousr separation to reaction product makes ethene can obtain and make unreacted ethane recycle to use.On the other hand, if use the chlorine of too many amount, will cause the generation of many chloro-products and other by product and carbon deposit.We find, the result that can obtain when above at 0.9: 1 mol ratio of chlorine when ethane, general molar ratio range is 1: 1 to 4: 1, and preferred ethane is 1: 1 to 2: 1 to the molar ratio range of chlorine, and is particularly preferred from 1.3: 1.0 to 1.6: 1.0 molar ratio range.

Ethane can be undertaken by arbitrary process with mixing of chlorine, and this process can produce a kind of tight gaseous mixture.If mix not exclusively, when this gaseous mixture enters reactor, will side reaction take place and generate many chlorinated compounds, second piece even carbon deposit in the high zone of chlorine content.We find, gas can be obtained satisfied mixed effect by a packed column.Yet this area stager, other blending means is obviously for those.

Ethane is sent into this mixture in one inerted reactor and heating therein with after chlorine mixes.When being heated to about 215 ℃, beginning to take place thermopositive reaction between ethane and the chlorine and cause temperature further to raise.Nearly 600 ℃ the time, the heat absorption dehydrohalogenation generates the generation that is swift in response of ethene.Subsequently, in order to realize purpose of the present invention, the temperature in the conversion zone should be above 600 ℃.The top temperature of conversion zone had better not be for a long time above 800 ℃.If high-temperature time very short (being about a second) then temperature also can be above 800 ℃.React the temperature range that is preferably in 600-800 ℃ and carry out, the final temp of the mixture that has reacted is particularly preferred at about 650 ℃ to 750 ℃.

In order to reach purpose of the present invention, it is particularly important that the internal surface of reactor should be inactive surfaces.Many metallic reactors can cause side reaction and cause the generation of carbon deposit.We find that waddings such as quartz, silicon carbide, aluminum oxide, graphite are suitable materials.Yet a person skilled in the art does not need just can find other suitable inert material to do the liner of the reactor in the inventive method through undue experimentation.

Inerted reactor among the present invention can be made various ways such as tubular reactor, barrel type reactor or spherical reactor.It can be one reactor, perhaps also can be separated into several reaction.The reaction chamber of each separation again can be with identical or different speed heating.Single reactor can have the different district of heating rate.Gas also can be selected by the non-heating zone of single reactor or the non-heating chamber in the multiple-chamber reactor, in such reaction zone or reaction chamber, is controlled the temperature of reaction by the reaction heat of heat absorption and thermopositive reaction.If reactor is that a diameter is little of the tubular reactor that can cause plug flow, do not having under heating or the refrigerative situation a tangible temperature distribution that exports from entering the mouth to be arranged.Promptly in case be reflected at 215 ℃ or higher temperature initiation, then its temperature will carry out raising owing to thermopositive reaction (1), and temperature of reaction will reach a maximum value and with the termination of thermopositive reaction (1) and thermo-negative reaction carrying out and descend as reaction (2) and (4) then.In such reactor, can in the initial stage, provide heat, and provide heat in the stage in the end to promote thermo-negative reaction and take place and to keep temperature of reaction 600-800 ℃ scope with initiation reaction.The time of reaction is less than one minute usually.Yet have been found that in order to reduce the generation of monochloroethane the 6-8 reaction times of second should be arranged at least.

The inventive method is not limited to normal pressure, and it can carry out during up to 30 normal atmosphere at pressure.When selective pressure, must make balancing each other of material under the high pressure than high throughput and the desired external intensity of high-pressure reactor.Reaction is preferably in promptly to be lower than under 2 atmospheric pressure near normal atmosphere to be carried out.

In actual procedure, the inventive method can not make the hundred-percent conversion of the ethane that enters reactor.In view of the above, present method products obtained therefrom air-flow mainly comprises ethene, hydrogenchloride, some hydrogen and unreacted ethane.To this area stager, use some methods commonly used can at an easy rate reaction gas flow be carried out fractionation isolating various components, yet this is unnecessary, and hydrogenchloride and ethene can interact and generate 1.2-ethylene dichloride and vinylchlorid.A spot of ethane and hydrogen do not influence these reactions.

Oxi-chlorination is known, and therein ethylene, hydrochloric acid and oxygen source thing (normally air or pure oxygen) reaction generates the 1.2-ethylene dichloride.The general equation formula of this reaction is:

C ₂H ₄+2HCl+1/2O ₂→C ₂H ₄Cl ₂+H ₂O

Do not comprise the ethene and the hydrogenchloride of suitable proportion as the fruit product air-flow, can add or remove wherein a kind of or other reactant.This reaction is normally in 225-250 ℃ temperature range and carry out on a kind of catalyzer (as be loaded on the aluminum oxide cupric chloride), and its product is the 1.2-ethylene dichloride, and the 1.2-ethylene dichloride follows thermo-cracking and generate vinylchlorid.

The inventive method obtains further instruction by the synoptic diagram of Fig. 5.In Fig. 5, in fact raw material chlorine air-flow 11 and raw material ethane air-flow 12 can be envrionment temperatures.They are fed obtain a kind of complete blended air-flow 13 in the mixing device 10, this flow of feed gas 13 adds in reactors 14 then.Reactor 14 has a heating unit, the mixture heating up of chlorine and ethane can be arrived at least 215 ℃ with initiation reaction.Reactor 14 should provide enough heat to the mixture that is reacting so that the temperature of post reaction mixture 15 when leaving reactor 14 between 600-800 ℃.Post reaction mixture 15 can make this mixture poly-cold by a heat exchanger 16 then, and this cold air stream 17 is again through further separating and handling.As mentioned above, the internal surface of reactor 14 should be an inert and nonmetallic, preferably uses such as quartz, silicon carbide, aluminum oxide or graphite etc. as lining material.

Except as otherwise noted, the following examples are that the present invention specifically describes, but only are further explanations, and unrestricted the present invention.

Embodiment 1

Carried out a series of test, wherein the mixture of ethane and chlorine is an envrionment temperature, and its ethane changes in 0.94: 1 to 3.33: 1 scope the chlorine mol ratio.This mixture is fed an internal diameter 8cm, in the quartzy tubular reactor of the preheating of long 140cm.The reaction of ethane and chlorine is carried out under 625 ℃, 675 ℃ and 740 ℃ respectively, and this temperature is the hull-skin temperature at reactor middle part, i.e. so-called " mesexine temperature ".The residence time in reactor was approximately for 4 seconds.Reaction product, is analyzed with gas-chromatography after balance is set up by air cooling and water-cooled, and it the results are shown in Table 1.

The productive rate of ethene, vinylchlorid and monochloroethane is seen Fig. 1, Fig. 2 and Fig. 3 respectively to the curved line relation of mol ratio and temperature.

From table 1 and Fig. 1-3 as can be seen, when temperature of reaction surpassed 650 ℃, the productive rate of vinylchlorid was along with ethane in the raw material reduces the increase of the mol ratio of chlorine.In addition, the productive rate of monochloroethane improves along with the reduction of temperature of reaction, and when lesser temps also along with raw material in ethane to the increase of the mol ratio of chlorine and improve.So, under 625 ℃ temperature, be about ethene that just can obtain in 1: 1 o'clock and vinylchlorid productive rate to the ratio of chlorine just at ethane.

Embodiment 2

Device has carried out a series of tests described in the employing embodiment 1, and wherein the mol ratio of ethane/chlorine is 1.39: 1 in the raw material, and the temperature of reactor is 675 ℃, but retention time changed in 3 seconds to 11 seconds.The productive rate of the consumption of its ethane and ethene, vinylchlorid and monochloroethane sees Table 2.

The consumption of ethane and product productive rate and the relation of the functional dependence between the reaction times are seen Fig. 4.

Obviously, the increase reaction times can be improved the productive rate of ethene and be reduced the productive rate of monochloroethane, but the transformation efficiency of ethane and the productive rate of vinylchlorid are not significantly influenced.

Comparative Examples A

Present embodiment is copied United States Patent (USP) 2,259, embodiment 1 test conditions of giving in 195, and different is replaces butane in this patent working example with ethane.Is 2.2mm with the chlorine of 60 liters/hour ethane and 120 liters/hour at an internal diameter, long for being pre-mixed in the polyfluortetraethylene pipe of 50cm, the quartz capillary that this mixture is 2mm by an internal diameter, this kapillary fills up with the pediment shape plate support of perforate, and heat with electric furnace the periphery.Resulting reaction mixture is again by a cold air system and a water cooling interchanger.This pediment shape plate is arranged in the silica tube that an internal diameter is 15mm.The skin temperature of this pipe can be measured.Be 300 ℃, 600 ℃ and 800 ℃ in the skin temperature of reactor and test, all form a large amount of carbon deposits in the test under described these temperature.In fact, the formation of carbon deposit is so serious so that under each situation behind steady air current less than one minute, reacting pipe is stopped up by carbon deposit.Because the operating time is very short, gas chromatographic analysis can't measure in the reaction process, also has what other product to generate except carbon deposit.

Table 1: the relation of the productive rate of ethene, vinylchlorid and monochloroethane and temperature and ethane/chlorine mol ratio

Reaction conditions		Productive rate (%)
					Temperature (℃)	Ethane/chlorine mol ratio	Ethene	Vinylchlorid	Monochloroethane
740	1.08:1 1.61:1 2.43:1 3.21:1	72.4 84.4 88.1 88.5	13.7 7.3 3.2 2.5	0 0 0 0
					675	1.04:1 1.68:1 2.48:1 3.31:1	67.0 78.9 82.4 80.6	24.6 13.3 9.4 6.7	3.3 4.8 4.6 9.5
625	0.94:1 1.65:1 2.61:1 3.33:1	62.1 53.3 46.0 44.4	28.5 15.2 8.1 6.7	5.5 30.1 43.0 47.2

Table 2

Reaction times (second)	Ethane conversion (%)	Productive rate (%)
						Ethene	Vinylchlorid	Ethene+vinylchlorid	Monochloroethane
		2.9 3.7 7.3 11.0	69.8 69.8 70.5 68.8	71.7 72.3 79.5 79.5	17.3 17.9 16.2 15.7					89 90.2 95.7 95.2	6.6 5.9 0.2 0

Claims (18)

1, a kind ofly prepare the method for ethene or ethene and vinyl chloride mixture by ethane and chlorine reaction, this method comprises:

A, provide a kind of ethane feed air-flow and a kind of chlorine feed air-flow;

B, 0.9 the ratio of being at least according to ethane/chlorine mol ratio be thorough mixing in a mixing tank with described ethane and chlorine feed gas;

The temperature of the temperature of c, described ethane feed gas and described chlorine feed gas must be in described mixing process and the mixed instantaneous chemical reaction that do not take place basically;

D, described mixture is fed in the inerted reactor;

E, with the initiating chamical reaction between ethane and chlorine of the mixture heating up in the described inerted reactor;

F, continuation provide heat so that this post reaction mixture reaches 600 ℃ to 800 ℃ temperature range to the described mixture that is reacting;

According to said method, total molar yield of ethene and vinylchlorid is at least 80% in used up ethane.

2, a kind of by the process of claim 1 wherein that the mixture of described ethane and chlorine is lower than 215 ℃ in described mixed transient temperature.

3, a kind of method by claim 2, wherein said temperature is an envrionment temperature.

4, a kind of method by claim 1, the temperature of wherein said post reaction mixture is in 600 ℃ to 800 ℃ scopes.

5, a kind of method by claim 1, the temperature of wherein said post reaction mixture is 650 ℃ to 750 ℃ scopes.

6, a kind of method by claim 1, wherein said ethane to the mol ratio of chlorine in 1: 1 to 4: 1 scope.

7, a kind of method by claim 1, wherein said ethane to the mol ratio of chlorine in 1: 1 to 2: 1 scope.

8, a kind of method by claim 1, wherein said ethane to the mol ratio of chlorine in 1.3: 1 to 1.6: 1 scope.

9, a kind of method by claim 1, the described mixing process that is reflected between wherein said ethane and the chlorine begins to finish basically in back about 1 minute.

10, a kind of method by claim 1, the described mixing process that is reflected between wherein said ethane and the chlorine begins to finish basically in back about 10 seconds.

11, a kind of method by claim 1, the reaction between wherein said ethane and the chlorine are to carry out in being selected from the inerted reactor that quartz, silicon carbide, aluminum oxide, graphite material make.

12, a kind of method by claim 1, this method comprise that further the ethene and the hydrogenchloride that are produced by ethane and chlorine reaction generate ethylene dichloride with a kind of oxygen source thing reaction again.

13, a kind of method by claim 11, this method comprise that further the described ethylene dichloride of heating is with preparation vinylchlorid.

14, a kind of method by claim 1, wherein the temperature of post reaction mixture and comprises that further the monochloroethane in the described post reaction mixture of cracking generates ethene and vinylchlorid between 400 ℃-600 ℃.

15, a kind of method by claim 14, wherein said cracking be about 500 ℃ and have a kind of dehydrohalogenation catalyzer in the presence of carry out.

16, a kind of method by claim 1 wherein accounts for 50% of raw material ethane at least by the ethane that single-pass conversion behind the described reactor falls.

17, a kind of method by claim 1, this method further comprises provides catalyst for reaction between a kind of promotion ethane and the chlorine.

18, a kind ofly prepare the method for ethene or ethene and vinyl chloride mixture, comprising by ethane and chlorine reaction:

A, provide a kind of ethane feed air-flow and a kind of chlorine feed air-flow;

B, according to ethane be to the chlorine mol ratio 1.1: 1 to 1.9: 1 ratio with described ethane and chlorine feed gas thorough mixing in a mixing tank;

C, described ethane feed gas and chlorine feed gas are in envrionment temperature so that in described mixing process and the mixed instantaneous chemical reaction that do not take place basically;

D, described mixture is fed in the inerted reactor;

E, with the initiating chamical reaction between ethane and chlorine of the mixture heating up in the described inerted reactor;

F, continuation provide heat so that post reaction mixture reaches 650 ℃ to 750 ℃ temperature range to the described mixture that is reacting;

According to said method, total molar yield of ethene and vinylchlorid is at least 90% in used up ethane.

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